why do you have that size on the car? It is taller then factory.
The stock tire size is a 225/40/18.
You can safely go with a 235/40/18 without affecting the speedometer much. Some will say you can go with a 245/35/18, and it will fit on the car, but you will give up sidewall stiffness and cause sidewall roll in any sort of aggressive driving.
I would stick to a 235/40/18.
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